Abstract
Forty-eight consecutive patients with treated thyroid carcinoma were studied with 131-I total body scans and serum thyroglobulin (hTg) levels. Serum hTg levels during thyroxine treatment accurately predicted scan results (chi square = 18.6, p < 0.001). All patients with negative scans (24 patients) had serum hTg levels (< 7 ng/ml whereas in patients with metastatic thyroid cancer (eight patients) they ranged from 11 to 690 ng/ml. In patients with iodine uptake confined to the thyroid bed (16 patients) serum hTg values ranged from 2 to 17 ng/ml. Serum hTg levels rose in patients with negative scans during hypothyroidism or after exogenous TSH suggesting that hTg levels are more sensitive than iodine scans in detecting residual thyroid tissue. Serum hTg levels could replace total body iodine scans in many patients with treated thyroid carcinoma.
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